Most of the material about OIO EA is in Danish, but see this Introduction to the 2007 OIO EA Method as well as the English version of the original White Paper on Enterprise Architecture from 2003. The OIO framework is today widely adopted across all tiers and levels of government (Enterprise Architecture for e-Government). Various parts of the framework are also used outside government in private business sectors including the financial sector. The framework includes standards in operation both in government and in the private sector such as interoperability standards and infrastructure solutions used in relation to login (eg. NemID) or exchange of business documents (eg NemHandel).

In 2013, OIO EA 2.0 beta and the OIO Architecture guide was set up to help Danish authorities and institutions as well as their suppliers get an overview of common, cross-governmental principles, requirements, methodologies, models, standards, infrastructure, governance etc. in relation to digitalization – all served within the National Interoperability Framework (NIF).